Show updated relation reply from edited message - v2 (#6817)
Part of https://github.com/vector-im/element-web/issues/10391
When `m.relates_to` -> `m.in_reply_to` is provided in `m.new_content`
for an edited message, use the updated reply.
ex.
```json
{
"type": "m.room.message",
"content": {
"body": " * foo bar",
"msgtype": "m.text",
"m.new_content": {
"body": "foo bar",
"msgtype": "m.text",
"m.relates_to": {
"m.in_reply_to": {
"event_id": "$qkjmFBTEc0VvfVyzq1CJuh1QZi_xDIgNEFjZ4Pq34og"
}
}
},
"m.relates_to": {
"rel_type": "m.replace",
"event_id": "$lX9MRe9ZTFOOvnU8PRVbvr1wqGtYvNQ1rSot-iUTN5k"
}
}
}
```
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